watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.5.81:6536] Modules linked in: irq event stamp: 13898509 hardirqs last enabled at (13898508): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (13898509): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (24416): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (24416): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (24416): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (24527): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (24527): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (24527): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 6536 Comm: syz.5.81 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__kasan_check_write+0x0/0x20 mm/kasan/shadow.c:36 Code: 48 8b 0c 24 31 d2 e9 8f e5 ff ff 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 89 f6 48 8b 0c 24 ba 01 00 00 00 e9 5c e5 ff ff 66 66 RSP: 0018:ffffc90000a07f40 EFLAGS: 00000286 RAX: 0000000000000000 RBX: ffffc90000a08080 RCX: ffff88807bb5bc80 RDX: 0000000000000100 RSI: 0000000000000008 RDI: ffffc90000a08090 RBP: 0000000000000005 R08: ffff88807bb5bc80 R09: 000000000000000b R10: 000000000000000a R11: 0000000000000100 R12: 0000000000000001 R13: dffffc0000000000 R14: 0000000000000004 R15: 0000000000000000 FS: 00007f351e5926c0(0000) GS:ffff888125596000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3101aff8 CR3: 0000000078602000 CR4: 00000000003526f0 Call Trace: instrument_write include/linux/instrumented.h:41 [inline] ___set_bit include/asm-generic/bitops/instrumented-non-atomic.h:28 [inline] ipv6_get_saddr_eval+0xb85/0xee0 net/ipv6/addrconf.c:1713 __ipv6_dev_get_saddr+0x1af/0x440 net/ipv6/addrconf.c:1760 ipv6_dev_get_saddr+0x2c7/0xbb0 net/ipv6/addrconf.c:1896 ip6_route_get_saddr include/net/ip6_route.h:147 [inline] ip6_dst_lookup_tail+0xfb7/0x15a0 net/ipv6/ip6_output.c:1133 ip6_dst_lookup_flow+0x47/0xe0 net/ipv6/ip6_output.c:1259 udp_tunnel6_dst_lookup+0x24d/0x470 net/ipv6/ip6_udp_tunnel.c:165 geneve6_xmit_skb drivers/net/geneve.c:1428 [inline] geneve_xmit+0x13a6/0x3110 drivers/net/geneve.c:1515 __netdev_start_xmit include/linux/netdevice.h:5275 [inline] netdev_start_xmit include/linux/netdevice.h:5284 [inline] xmit_one net/core/dev.c:3864 [inline] dev_hard_start_xmit+0x2cd/0x7f0 net/core/dev.c:3880 __dev_queue_xmit+0x168f/0x3850 net/core/dev.c:4829 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:246 NF_HOOK include/linux/netfilter.h:318 [inline] ndisc_send_skb+0xbaa/0x14e0 net/ipv6/ndisc.c:512 addrconf_rs_timer+0x395/0x6d0 net/ipv6/addrconf.c:4042 call_timer_fn+0x192/0x5a0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:strlen+0x1f/0x70 lib/string.c:420 Code: 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 41 54 53 48 c7 c0 ff ff ff ff 49 be 00 00 00 00 00 fc ff df 48 89 fb <49> 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 11 48 ff c3 RSP: 0018:ffffc90003b4f6f8 EFLAGS: 00000206 RAX: 0000000000000009 RBX: ffffffff8bce00ca RCX: 000000008bce0001 RDX: 0000000000000000 RSI: ffffffff8e7603e0 RDI: ffffffff8bce00c0 RBP: ffffc90003b4f818 R08: 0000000000000002 R09: 0000000000000000 R10: ffffc90003b4f508 R11: ffffffff81aff200 R12: ffffffff8e62c320 R13: ffffffff8e7603e0 R14: dffffc0000000000 R15: 0000000000000008 __fortify_strlen include/linux/fortify-string.h:266 [inline] trace_event_get_offsets_lock_acquire include/trace/events/lock.h:24 [inline] do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0xd7/0x420 include/trace/events/lock.h:24 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x2ea/0x330 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] class_rcu_constructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4459 [inline] slab_alloc_node mm/slub.c:4788 [inline] kmem_cache_alloc_lru_noprof+0x2b8/0x640 mm/slub.c:4807 sock_alloc_inode+0x28/0xc0 net/socket.c:322 alloc_inode+0x6a/0x1b0 fs/inode.c:347 new_inode_pseudo include/linux/fs.h:2993 [inline] sock_alloc net/socket.c:637 [inline] __sock_create+0x12d/0x9d0 net/socket.c:1569 sock_create net/socket.c:1663 [inline] __sys_socket_create net/socket.c:1700 [inline] __sys_socket+0xd6/0x1b0 net/socket.c:1747 __do_sys_socket net/socket.c:1761 [inline] __se_sys_socket net/socket.c:1759 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1759 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f351d79c629 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f351e592028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f351da15fa0 RCX: 00007f351d79c629 RDX: 0000000000000010 RSI: 0000000000000003 RDI: 0000000000000010 RBP: 00007f351d832b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f351da16038 R14: 00007f351da15fa0 R15: 00007ffeb039aac8 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6550 Comm: syz.6.83 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline] RIP: 0010:write_comp_data kernel/kcov.c:245 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x8/0x90 kernel/kcov.c:314 Code: 89 44 11 20 e9 19 f0 de 09 cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 15 98 e8 53 11 65 8b 0d b9 e8 53 11 81 e1 00 01 ff 00 74 RSP: 0018:ffffc900000073d8 EFLAGS: 00000046 RAX: ffffffff81b1a141 RBX: 0000000000000001 RCX: 0000000000010102 RDX: ffff888079f09e40 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000007540 R08: ffffc900000070d7 R09: 0000000000000000 R10: ffffc900000070c8 R11: ffffffff816ac320 R12: ffff88803738e5f0 R13: dffffc0000000000 R14: ffff8880b8628348 R15: ffff8880b8628300 FS: 00007f11ab9d56c0(0000) GS:ffff888125496000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555587f274e8 CR3: 000000007d676000 CR4: 00000000003526f0 Call Trace: __run_hrtimer kernel/time/hrtimer.c:1751 [inline] __hrtimer_run_queues+0x291/0xc30 kernel/time/hrtimer.c:1849 hrtimer_interrupt+0x42b/0x1010 kernel/time/hrtimer.c:1911 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x3d0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:kasan_quarantine_put+0x6a/0x1f0 mm/kasan/quarantine.c:237 Code: 18 ee 19 93 01 75 32 41 f7 c7 00 02 00 00 74 05 e8 bb 59 9e ff 9c 58 a9 00 02 00 00 75 78 41 f7 c7 00 02 00 00 74 01 fb 31 c0 <5b> 41 5c 41 5d 41 5e 41 5f e9 88 6f 75 09 cc 48 8d 80 00 ee 19 93 RSP: 0018:ffffc90000007778 EFLAGS: 00000206 RAX: 0000000000000001 RBX: ffff88806ac3f400 RCX: 0000000000000101 RDX: 0000000000000002 RSI: ffffffff8deec7f5 RDI: ffffffff8c278880 RBP: 0000000000000000 R08: ffffffff90111eb7 R09: 1ffffffff20223d6 R10: dffffc0000000000 R11: fffffbfff20223d7 R12: ffff88806ac3f400 R13: 0000000000000000 R14: 0000000000036180 R15: 0000000000000286 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2670 [inline] slab_free mm/slub.c:6082 [inline] kmem_cache_free+0x180/0x610 mm/slub.c:6212 skb_kfree_head net/core/skbuff.c:1087 [inline] skb_free_head net/core/skbuff.c:1101 [inline] skb_release_data+0x6c3/0x940 net/core/skbuff.c:1128 skb_release_all net/core/skbuff.c:1203 [inline] __kfree_skb+0x5d/0x210 net/core/skbuff.c:1217 kfree_skb_reason include/linux/skbuff.h:1322 [inline] neigh_connected_output+0x3e9/0x460 net/core/neighbour.c:1651 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:246 NF_HOOK include/linux/netfilter.h:318 [inline] ndisc_send_skb+0xbaa/0x14e0 net/ipv6/ndisc.c:512 addrconf_rs_timer+0x395/0x6d0 net/ipv6/addrconf.c:4042 call_timer_fn+0x192/0x5a0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:finish_task_switch+0x245/0x920 kernel/sched/core.c:5152 Code: 00 00 48 85 db 0f 85 e8 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 49 83 c4 48 4c 89 e7 e8 95 07 0f 0a e8 80 3a 38 00 fb 4c 8b 65 c0 <49> 8d bc 24 30 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 RSP: 0018:ffffc9000451f398 EFLAGS: 00000206 RAX: 000000000067f059 RBX: 0000000000000000 RCX: 0000000080000001 RDX: 0000000000000007 RSI: ffffffff8deec7f5 RDI: ffffffff8c278880 RBP: ffffc9000451f3f0 R08: ffffffff90111eb7 R09: 1ffffffff20223d6 R10: dffffc0000000000 R11: fffffbfff20223d7 R12: ffff888079f09e40 R13: dffffc0000000000 R14: ffff888030289e40 R15: ffff8880b863b718 context_switch kernel/sched/core.c:5298 [inline] __schedule+0x1584/0x52b0 kernel/sched/core.c:6907 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234 irqentry_exit+0x599/0x620 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:unwind_next_frame+0x1381/0x23c0 arch/x86/kernel/unwind_orc.c:-1 Code: 24 48 74 0c 4c 89 e7 e8 6d 15 b8 00 48 8b 14 24 4d 89 3c 24 41 0f b6 44 2d 00 84 c0 0f 85 02 0e 00 00 c6 03 00 4c 8b 64 24 48 <4c> 8b 7c 24 28 48 8b 44 24 40 0f b6 04 28 84 c0 0f 85 6c 0b 00 00 RSP: 0018:ffffc9000451f738 EFLAGS: 00000246 RAX: ffffc9000451f858 RBX: ffffc9000451f840 RCX: 0000000000000000 RDX: ffffffff90b237e0 RSI: 0000000000000000 RDI: ffffc9000451f868 RBP: dffffc0000000000 R08: ffffc9000451f867 R09: 0000000000000000 R10: ffffc9000451f858 R11: fffff520008a3f0d R12: ffffc9000451f858 R13: 1ffff920008a3f03 R14: ffffc9000451f808 R15: ffffc9000451f850 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 save_stack+0x122/0x230 mm/page_owner.c:165 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:320 reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1432 [inline] __free_frozen_pages+0xc00/0xd90 mm/page_alloc.c:2977 __slab_free+0x263/0x2b0 mm/slub.c:5490 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4459 [inline] slab_alloc_node mm/slub.c:4788 [inline] __do_kmalloc_node mm/slub.c:5176 [inline] __kmalloc_noprof+0x316/0x760 mm/slub.c:5189 kmalloc_noprof include/linux/slab.h:966 [inline] sk_prot_alloc+0xe7/0x210 net/core/sock.c:2245 sk_alloc+0x3a/0x390 net/core/sock.c:2301 __netlink_create+0x65/0x260 net/netlink/af_netlink.c:626 netlink_create+0x3ca/0x590 net/netlink/af_netlink.c:684 __sock_create+0x4b2/0x9d0 net/socket.c:1605 sock_create net/socket.c:1663 [inline] __sys_socket_create net/socket.c:1700 [inline] __sys_socket+0xd6/0x1b0 net/socket.c:1747 __do_sys_socket net/socket.c:1761 [inline] __se_sys_socket net/socket.c:1759 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1759 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f11ad79c629 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f11ab9d5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f11ada16090 RCX: 00007f11ad79c629 RDX: 0000000000000006 RSI: 0000000000000003 RDI: 0000000000000010 RBP: 00007f11ad832b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f11ada16128 R14: 00007f11ada16090 R15: 00007ffe41c82c78